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Exhaust Requirements
70269701
36
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Manifold Venting
While it is preferable to exhaust tumblers individually
to the outdoors, a main collector duct may be used if it
is sized according to Figure 11. This illustration
indicates minimum diameters, which should be
increased if the collector length exceeds 14 feet
(4.3 meters) and two 90° elbows. The diameter of a
round duct must be increased by 10% for each
additional 20 feet (6.1 meters). Cross sectional area of
a rectangular or square duct must be increased 20% for
each additional 20 feet (6.1 meters). Refer to Table 4
to determine equivalent ducting sizing. The collector
duct may be rectangular or square in cross section, as
long as the area is not reduced. Provisions MUST be
made for lint removal and cleaning of the collector
duct.
The vent collector system must be designed so the
static back pressure measured 12 inches (305 mm)
from the exhaust outlet does not exceed the maximum
allowable pressure specified on the installation sticker
on the rear of tumbler. Static back pressure must be
measured with all tumblers vented into the collector
operating.
NOTE: Never connect a tumbler duct at a 90°
angle to the collector duct. Refer to Figure 10.
Doing so will cause excessive back pressure,
resulting in poor performance. Never connect two
tumbler exhaust ducts directly across from each
other at the point of entry to the collector duct.
With the tumbler (both pockets on stacked models) in
operation, airflow at any point in the duct should be at
least 1200 feet per minute (366 meters per minute) to
ensure that lint remains airborne. If 1200 feet per
minute cannot be maintained, schedule a regular
inspection and cleaning of the ductwork.
The collector system must be designed so the static
back pressure measured 12 inches (305 mm) from the
exhaust outlet does not exceed the maximum
allowable pressure specified on the installation sticker
on the rear of tumbler. This must be measured with all
tumblers vented into the collector operating.
Figure 10
T438I